So my shonen take from this:
Shinomiya's dad pushes Hibino hard to check if he can handle the unleashed monster inside him. Pretty sure he understands a fully controlled Hibino is a lot better than using his body parts as weapons. But if Hibino loses against his kaiju side, then his body parts are still valuable.
The shonen fight is lame, or rather how it starts and works. Nice visuals. Also why would the daughter witness that. I understand she serves as a witness and will be the link to Hibino's getting back to the team. Well the whole setting is dumb.

The whole part of Hibino being detained like this is some kind of test too.

Didn't think about the obvious idea the public better not know some humans can turn to Kaijus. After all nobody has seen how it happened like we did.